[PATCH v2 00/71] bootstd: Allow migration from distro_bootcmd scripts

Tom Rini trini at konsulko.com
Tue Jan 17 14:57:07 CET 2023

On Sat, Jan 07, 2023 at 07:49:36PM -0700, Simon Glass wrote:

> So far, standard boot does not replicate all the of the functionality
> of the distro_bootcmd scripts. In particular it lacks some bootdevs and
> some of the bootmeths are incomplete.
> Also there is currently no internal mechanism to enumerate buses in order
> to discover bootdevs, e.g. with USB.
> This series addresses these shortcomings:
> - Adds the concept of a 'bootdev hunter' to enumerate buses, etc. in an
>   effort to find bootdevs of a certain priority
> - Adds bootdevs for SCSI, IDE, NVMe, virtio, SPI flash
> - Handles PXE and DHCP properly
> - Supports reading the device tree with EFI and reading scripts from the
>   network
> It also tidies up label processing, so it is possible to use:
>    bootflow scan mmc2
> to scan just one MMC device (with BOOTSTD_FULL).
> As before this implementation still relies on CONFIG_CMDLINE being
> enabled, mostly for the network stack. Further work would be required to
> disentangle that.
> Quite a few tests are added but there are some gaps:
> - SPI flash bootdev
> - EFI FDT loading
> Note that SATA works via SCSI (CONFIG_SCSI_AHCI) and does not use
> driver model. Only pogo_v4 seems to be affected. Probably all thats is
> needed is to call bootdev_setup_sibling_blk() in the Marvell SATA driver.
> Also, while it would be possible to init MMC in a bootdev hunter, there is
> no point since U-Boot always inits MMC on startup, if present.
> With this series it should be possible to migrate boards to standard boot
> by removing the inclusion of config_distro_bootcmd.h and instead adding
> a suitable value for boot_targets to the environment, e.g.:
>    boot_targets=mmc1 mmc0 nvme scsi usb pxe dhcp spi
> Thus it is possible to boot automatically without scripts and boards can
> use a text-based environment instead of the config.h files.
> To demonstrate this, rockpro64-rk3399 is migrated to standard boot in this
> series. Full migration could probably be automated using a script, similar
> in concept to moveconfig:
>    - obtain the board environment via 'make u-boot-initial-env'
>    - get the value of "boot_targets"
>    - drop config_distro_bootcmd.h from the config.h file
>    - rebuild again to get the environment without distro scripts
>    - write the environment (adding boot_targets) to board.env
>    - remove CONFIG_EXTRA_ENV_SETTINGS from the config.h file
> This series is based on top of the boot menu series v3 [1].
> The tree is available at u-boot-dm/dis-working
> [1] https://patchwork.ozlabs.org/project/uboot/list/?series=335364
> Changes in v2:
> - Rebase to -next

A small problem is that patch 62 was missing, but I could rebase v1
easily enough. A number of other patches needed to be rebased on top of
Sean's source command updates for confs in FIT images to be used. I
thought I got this part done right as well, but most of the new tests
then failed. Please rebase again on top of current master, sorry.

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